Feed-pump



v (No Model.)

L. STEWART.

FEED PUMP.

No. 247,704. Patented Sept. 27,1881.

1m enow. 1011x1 0 $Lewoxb 4g News.

UNITED STATES PATENT OFFICE.

LORENZO STEWART, OF SOHENEOTADY, YORK.

FEED-PUMP.

SPECIFICATION forming part of Letters Patent No. 247,704, datedSeptember 27, 1881. Application filed May 21, 1881. (N0 model.)

To all whom it may concern Be it known that I, LORENZO STEWART, acitizen of the United States, residing at Schenectady,in the county ofSchenectady and State of New York, have invented new and usefulImprovements in Feed-Pumps, of which the following is a specification.

This invention relates especially to pumps for feeding water tosteam-boilers; and it consists in the combination of the followingelements: The pump-barrel, plunger, suctionvalve, discharge-valve,air-chamber, and a regulating-valve intermediate of the pump-barrel andthe air-chamber, so that it the regulatingvalve is opened, a portion ofthe water going through the pump is alternately and continuously forcedinto and out from the air-chamber, reducingthe quantity of feed-water toa corresponding degree, and hence the action of the pump can. becontrolled simply by adjusting the regulating-valve.

This invention is illustrated in the accompanying drawings, in whichFigure 1 represents alongitudinal vertical section. Fig.2is a plan ortop View.

Similar letters indicate cor: esponding parts.

The letter A designates a portion of the pump-barrel; B, a portion ofthe plunger; 0,

the suction-valve chamber O, the dischargevalve chamber, each of saidvalve-chambers provided with any suitable valve; D, the airchamber, andE the regulating-valve.

The plunger B is worked by any suitable connection to the engine, andthe valves 0 O are connected to the pump-barrel on the side and near oneend thereof, these valves being in a line with each other, while theregulatingvalve E is connected to the end of the barrel,. Thisregulating-valve E.

as by a coupling, F. is of ordinary construction, the valve proper, a,being secured to a stem, b, and beinglitted to a seat, 0, in the shelld. The regulating-valve E is also connected to the air-chamber D, as bya coupling, G, so that it is brought intermediate of the pump-barrel andthe air-chamber.

If, when the regulating-valve is closed, as shown, the plunger B iswithdrawn, the water is drawn into the pump-barrel through thesuction-valve G, and on the return-stroke of the plunger it is entirelyforced out through the discharge-valve C. If, however, theregulating-valve E is opened, a portion of the water contained in thepump-barrel is forced into the air-chamber D on the return stroke of theplunger, compressing the air therein, and on the next withdrawal of theplunger this portion of the water'is forced back into the pumpbarrel bythe reaction of the air, while another portion is drawn through thesuctionvalve 0 from the supply-source to fill the barrel. Then, on thenext return-stroke of the plunger, a portion of the water equal to that'drawn into the pump-barrel from the supplysource escapes through thedisch arge-valve 0, while the remainder again enters the air-chamberD.Thusbyadjustingtheregulating-valve E to allow a greater or less portionof the water to enter the air-chamber D the quantity fed to theboilercan be readily controlled.

Another feature of my pump is that it is filled with water at eachstroke of the plunger, and thereby the disagreeable slamming noise, andconsequent wear upon the valves, produced when attempts are made toregulate the feed by partly checking the supply is avoided.

If the regulating-valve E is opened wide,the water merely circulates toand fro between the air-chamber and the pump-barrel.

What I claim as new, and desire to secure by Letters Patent, is-- 1. Ina feed supply for steam -boilers, the combination, with the pump-barrel,of an airchainber and an adjustable regulating-valve arranged between,the air chamber and'the pump-barrel, and having its valve-chamber incommunication with the pumpbarrel and the air-chamber, substantially asand for the purpose described.

2. In a feed-supply pump for steam-boilers, the combination, with apump-barrel provided with valve-chambers, as described, of an adjustableregulating-valve arranged in line with the pump-barrel and between thesuction and discharge valve chambers, and an air-chamber arrangedaboveand communicating with the valve-chamber of the regulating-valve, allsubstantially as and for the purpose described.

In testimony whereof I have hereunto set my hand and seal in thepresence of two subscribing witnesses.

- LORENZO STEWART.

Witnesses:

J AY THELINGHOUSE, H. R. HEGEMAn.

